Gutter is a method of selecting long-term storage of fruit by selecting a suitable site, digging it into a trench, storing the fruit in it, and using natural cooling. It has the characteristics of larger capacity, less labor, low cost, low loss and high efficiency. Especially suitable for mass storage of late-maturing apple varieties. 1. The construction of trenches should be chosen where the terrain is flat, open, sunny, leeward, solid, high dry, and water-free, and convenient in transportation and management. It is advisable to store the fruit ditch in the east-west direction so that cold-proof equipment can be erected. The ditch is generally 0.8-1 m deep and 1-1.2 m wide. The length is determined by the topography and the amount of fruit stored. The ditch is surrounded by a soil about 30 cm high. 2, the method of the ditch After the fruit is harvested, it is first stored in a cool and ventilated place, and the stacking thickness is about 30 cm. After the frost falls into the ditch (average temperature of 5 to 10 degrees Celsius is appropriate). Before entering the ditch, the bottom of the ditch is covered with a layer of 5 to 6 cm thick clean sand that can be moisturized. The fruit that enters the ditch must be strictly selected, remove the disease and fruit, mechanical injury. Then start the fruit from one end of the ditch and lay it layer by layer, with a thickness of 60-70 cm. The ditch is piled up in sections, leaving a certain space. Every 3-5m is erected with a straw or corn stalk. Ventilation handle. In the top of the fruit pile covered with a layer of mats, the top of the groove to be built into a roof ridge, shade to prevent snow, cold and warm, but also pay attention to prevent rat damage. The north side of the ditch is 1 meter away from the ditch. A wind barrier made of corn stalks is erected to resist cold winds. 3. In the initial period of management and storage after entering the ditch, the ditch temperature and fruit temperature are reduced by using cold air that sinks in the evening. Covers are covered during the day and removed at night. As the temperature drops, the ditch cover is gradually thickened. Usually divided into 2 to 3 times, each covering soft grass 10-15 cm thick, and then tightly covered with corn stover. In the late period of storage, that is, early next spring, when the air starts to warm, the first thing is to properly uncover the cover, properly ventilate the air to prevent the temperature in the ditch from rising too fast, and to avoid freezing and freezing the fruits due to the sudden cold weather. Using this method to store apples until March of the following year, the loss rate is only about 2.5%.